What are the wooden stairs and what are the different features of their species?

By construction, concrete slabs stairs are divided into:

FLOATING - consisting of several flights of stairs;

Screw (circular) - without division marches,

combined - is a hybrid of the first two types.

Depending on availability of stair treads are open or closed. First treads do not have and consist only of the risers. In the second, there are those, and others.

Another classification divides stairs to species by the method of mounting the steps. According to her for fixing steps may be used:

beam-stringers supporting risers below;

bowstring, fixing ends risers and treads;

supporting columns - axial beams, which are attached to the inner parts of the steps.

The most widespread of these ways to get fixed on the Saddle. What is meant by "stringers"?

In the construction of the so-called beam serving as support for the riser boards. Stringers may have triangular recesses, and may be completely smooth. In the first case the risers are laid in recesses in the second - are mounted on top of the wooden bars (grasshoppers), which in turn is attached to the upper edges of the beams.

Fixing on the string assumes samples on the inside of poles or fences. Elements of steps - risers and treads - inserted in the ends of these samples and they are rigidly fixed.

Design wooden spiral staircase to the second floor or attic implies a mid reference column. As the latter can be used:

axial beam;

masonry;

wide ends of the individual risers.

Spiral staircases are usually provided with fencing. Another feature of such structures - wedge (winder), the form of steps. Narrow ends are fixed on the domestic stage column, based on the broad perimeter wall or inserted into the sample bent bowstrings.